a preview of a motion picture, often shown in addition to an announced film, in order to observe the reaction of the audience.
Origin of sneak preview
First recorded in 1935–40
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for sneak preview
a screening of a film at an unexpected time to test audience reaction before its release
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Idioms and Phrases with sneak preview
An advance showing of something, as in It was supposed to be bad luck but she gave the bridegroom a sneak preview of her wedding gown. This expression originated in the 1930s for a single public showing of a motion picture before its general release, and in succeeding decades was transferred to other undertakings.
The American Heritage® Idioms Dictionary
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